44 lines
1.3 KiB
Diff
44 lines
1.3 KiB
Diff
From b822a139e3997a0a09da940e5c88ea505459e81f Mon Sep 17 00:00:00 2001
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From: Hou Tao <houtao1@huawei.com>
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Date: Wed, 16 Nov 2022 15:23:48 +0800
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Subject: [PATCH] libbpf: Use page size as max_entries when probing ring buffer
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map
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Using page size as max_entries when probing ring buffer map, else the
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probe may fail on host with 64KB page size (e.g., an ARM64 host).
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After the fix, the output of "bpftool feature" on above host will be
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correct.
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Before :
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eBPF map_type ringbuf is NOT available
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eBPF map_type user_ringbuf is NOT available
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After :
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eBPF map_type ringbuf is available
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eBPF map_type user_ringbuf is available
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Signed-off-by: Hou Tao <houtao1@huawei.com>
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Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
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Link: https://lore.kernel.org/bpf/20221116072351.1168938-2-houtao@huaweicloud.com
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---
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src/libbpf_probes.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/libbpf_probes.c b/src/libbpf_probes.c
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index ecaae29..393b5cd 100644
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--- a/src/libbpf_probes.c
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+++ b/src/libbpf_probes.c
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@@ -243,7 +243,7 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
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case BPF_MAP_TYPE_RINGBUF:
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key_size = 0;
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value_size = 0;
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- max_entries = 4096;
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+ max_entries = sysconf(_SC_PAGE_SIZE);
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break;
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case BPF_MAP_TYPE_UNSPEC:
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case BPF_MAP_TYPE_HASH:
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--
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2.33.0
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